DOI: 10.1071/ch9672403. Magnetic properties and structure of some copper(II) complexes of pyridine and quinoline N-oxides

Magnetic properties and structure of some copper(II) complexes of pyridine and quinoline N-oxides

10.1071/ch9672403

Crossref journal-article

CSIRO Publishing

Australian Journal of Chemistry (67)

Abstract

The magnetism of various copper(II) complexes of pyridine and quinoline N-oxides1 has been further investigated. The compounds Cu(C5H5NO)nX2 (where n = 4 or 6, X = ClO4; n = 2, X = Cl, Br, NCS; n = 1, X = Cl, Br, CH3COO) and Cu(C9H7NO)nX2 where n = 4, X = ClO4; n = 2, X = Cl, Br, NO3; n = 1, X = Cl, Br, CH3COO) have been studied. The variation of the magnetic susceptibilities of most of these compounds is reported over a temperature range. The variation of the magnetic susceptibility with temperature for the weakly paramagnetic complex Cu(C5H5NO)Cl2 is discussed in terms of the binuclear oxygen-bridged structure previously postulated.1 The compound exhibits anti-ferromagnetic interaction between pairs of copper(II) atoms with a singlet-triplet separation of 2.1 kcal/mole. The compounds Cu(C5H5NO)2Cl2, Cu(C5H5NO)Br2, and Cu(C9H7NO)X2 (X = Cl, Br) are more weakly paramagnetic due to a larger singlet-triplet separation. The compound Cu(C5H5NO)2Br2 possesses a higher paramagnetic susceptibility than those of the previous compounds, and its magnetic properties are consistent with a dimeric structure involving a singlet- triplet separation of 0.7 kcal/mole. The copper(II) acetate adducts, Cu(CH3COO)2,L (L = C5H5NO or C9H7NO), possess very similar magnetic properties to binuclear copper(II) acetate monohydrate and presumably possess a similar structure, with the N-oxides replacing the water molecules. These compounds exhibit singlet-triplet energies of c. 1 kcal/mole similar to values reported for a large number of copper(II) alkanoates. The compounds Cu(C5H5NO)2(NCS)2, Cu(C5H5NO)4(ClO4)2, Cu(C5H5NO)6- (ClO4)2, Cu(C9H7NO)2X2 (X = Cl, Br, NO3), all obey the Curie-Weiss law and possess mean magnetic moments of 1.89, 1.80, 1.93, 1.88, 1.96, and 1.88 B.M. (corrected for θ values of -12, -7, -8, + -4, and -16�) respectively.

Bibliography

Gruber, S., Harris, C., Kokot, E., Lenzer, S., Lockyer, T., & Sinn, E. (1967). Magnetic properties and structure of some copper(II) complexes of pyridine and quinoline N-oxides. Australian Journal of Chemistry, 20(11), 2403.

Authors 6

SJ Gruber (first)
CM Harris (additional)
E Kokot (additional)
SL Lenzer (additional)
TN Lockyer (additional)
E Sinn (additional)

References 0 Referenced 36

None

Dates

Type	When
Created	15 years ago (Sept. 1, 2010, 7:43 p.m.)
Deposited	6 years, 9 months ago (Nov. 20, 2018, 7:55 p.m.)
Indexed	1 year, 6 months ago (Feb. 9, 2024, 12:25 a.m.)
Issued	58 years, 8 months ago (Jan. 1, 1967)
Published	58 years, 8 months ago (Jan. 1, 1967)
Published Print	58 years, 8 months ago (Jan. 1, 1967)

Funders 0

None

BibTeX

@article{Gruber_1967, title={Magnetic properties and structure of some copper(II) complexes of pyridine and quinoline N-oxides}, volume={20}, ISSN={0004-9425}, url={http://dx.doi.org/10.1071/ch9672403}, DOI={10.1071/ch9672403}, number={11}, journal={Australian Journal of Chemistry}, publisher={CSIRO Publishing}, author={Gruber, SJ and Harris, CM and Kokot, E and Lenzer, SL and Lockyer, TN and Sinn, E}, year={1967}, pages={2403} }

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  "abstract": "<jats:p>The magnetism of\nvarious  copper(II) complexes of pyridine\nand quinoline N-oxides1 has been further investigated.\nThe compounds Cu(C5H5NO)nX2\n(where n = 4 or 6, X = ClO4; n = 2, X =\nCl, Br, NCS; n = 1, X = Cl, Br, CH3COO)\nand Cu(C9H7NO)nX2\nwhere n = 4, X = ClO4; n = 2, X = Cl, Br, NO3; n = 1, X = Cl,\nBr, CH3COO) have been studied. The variation of the magnetic\nsusceptibilities of most of these compounds is reported over a temperature\nrange. \n\nThe variation of the magnetic\nsusceptibility with temperature for the weakly paramagnetic complex Cu(C5H5NO)Cl2 is discussed in terms of the binuclear\noxygen-bridged structure previously postulated.1\nThe compound exhibits anti-ferromagnetic interaction between pairs of copper(II)\natoms with a singlet-triplet separation of 2.1 kcal/mole. The compounds Cu(C5H5NO)2Cl2, Cu(C5H5NO)Br2, and Cu(C9H7NO)X2\n(X = Cl, Br) are more weakly paramagnetic due to a\nlarger singlet-triplet separation. The compound Cu(C5H5NO)2Br2 possesses a higher paramagnetic\nsusceptibility than those of the previous compounds, and its magnetic\nproperties are consistent with a dimeric structure involving a singlet- triplet\nseparation of 0.7 kcal/mole. The copper(II) acetate adducts, Cu(CH3COO)2,L\n(L = C5H5NO or C9H7NO), possess\nvery similar magnetic properties to binuclear copper(II) acetate monohydrate\nand presumably possess a similar structure, with the N-oxides replacing the\nwater molecules. These compounds exhibit singlet-triplet energies of c. 1\nkcal/mole similar to values reported for a large number of copper(II)\nalkanoates. \n\nThe compounds Cu(C5H5NO)2(NCS)2,\nCu(C5H5NO)4(ClO4)2,\nCu(C5H5NO)6- (ClO4)2,\nCu(C9H7NO)2X2 (X = Cl, Br, NO3), all obey the Curie-Weiss law and\npossess mean magnetic moments of 1.89, 1.80, 1.93, 1.88, 1.96, and 1.88 B.M.\n(corrected for \u03b8 values of -12, -7, -8, + -4, and -16\ufffd) respectively.</jats:p>",
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